660650663 has 2 divisors, whose sum is σ = 660650664. Its totient is φ = 660650662.

The previous prime is 660650633. The next prime is 660650677. The reversal of 660650663 is 366056066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660650663 - 2⁸ = 660650407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660650623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330325331 + 330325332.

It is an arithmetic number, because the mean of its divisors is an integer number (330325332).

Almost surely, 2^660650663 is an apocalyptic number.

660650663 is a deficient number, since it is larger than the sum of its proper divisors (1).

660650663 is an equidigital number, since it uses as much as digits as its factorization.

660650663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 660650663 is about 25703.1255492401. The cubic root of 660650663 is about 870.9447890087.

The spelling of 660650663 in words is "six hundred sixty million, six hundred fifty thousand, six hundred sixty-three".